4:1-9 Moses objects, that the people would not take his word, unless he showed them some sign. God gives him power to work miracles. But those who are now employed to deliver God's messages to men, need not the power to work miracles: their character and their doctrines are to be tried by that word of God to which they appeal. These miracles especially referred to the miracles of the Lord Jesus Christ. It belonged to Him only, to cast the power of the devil out of the soul, and to heal the soul of the leprosy of sin; and so it was for Him first to cast the devil out of the body, and to heal the leprosy of the body.And he said, put thine hand into thy bosom again,.... With the leprosy on it:

and he put his hand into his bosom again, and plucked it out of his bosom; quickly after he had put it in:

and, behold, it was turned again as his other flesh; it was cured of the leprosy, and recovered its colour, and was as sound as before, and as any other part of his body. This was a very astonishing miracle, that he should be at once smote with a leprosy; that this should be only in his hand, and not in any other part of his body; and that it should be cured immediately, without the use of any means; and by this miracle Moses, and the Israelites, might be instructed and confirmed in the power of God, that he that could so suddenly inflict such a disease, and so easily cure it, was able to deliver them out of captivity, which was as death; and that however until Moses might be in himself to be a deliverer of the people, signified by his weak and leprous hand, yet being quickened and strengthened by the Lord, would be able to answer to the character; though, after all, the deliverance must be imputed not to his hand and power, but to the mighty hand and power of God.